Wireless telegraphy is the transmission of electric telegraphy signals without wires (wirelessly). The term is used synonymously for radio communication systems, also called radiotelegraphy, which transmit telegraph signals by radio waves - wikipedia 
Illustration of Nikola Tesla's article in 1919 issue of "Electrical Experimenter"
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When the term originated in the late 19th century it also applied to other types of experimental wireless telegraph communication technologies, such as conduction and induction telegraphy.
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Muirhead Morse inker (Rankin Kennedy, Electrical Installations, Vol V, 1903) - wikimedia.org
Radio telegraphy often used manually-sent Morse code; radioteletype (RTTY) always uses mechanically generated and recorded characters.
Thomas Edison's 1891 patent for a ship-to-shore wireless telegraph that used electrostatic induction
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